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히스토리 정보를 활용한 사용자 지향의 검색 시스템 설계 및 구현
전병휘,김정희,곽호영 제주대학교 공과대학 첨단기술연구소 2002 尖端技術硏究所論文集 Vol.13 No.1
User oriented search system is proposed and implemented using the information of history. For offering more qualified information to user without the redundant search results and unnecessary information of legacy search system, this system uses user information and generates a keyword and category. Comparing user favorite category with search result of legacy search system through the agent oriented search engine, the result close to the user category is only supplied. At the same time, search result is saved as the history databases according to each category to be used for later search work. As a result, the redundant information of search result was efficiently removed and the information close to the user favorite category was obtained.
전병휘,황재효,민경일 永同大學校 2001 硏究論叢 Vol.7 No.1
본 논문에서는 tandem-stub mounted circuit를 이용한 X-band용 디지털 위상 변위기를 PIN 다이오드 이용한 설계 방법을 제시하고, 22.5˚및 90˚의 위상천이를 갖는 위상 변위기를 제작하였다 제작된 22.5˚와 90˚위상 변위기는 11.5 GHz∼12.5 GHz 대역에서 약 14 % 이내의 위상 오차와 중심 주파수에서 삽입손실은 최대 1.5 dB 이하의 특성과 반사손실 최소 14 dB 이하의 특성을 나타냈다. This paper presents the description of a digital phase shifter for X-band application that was designed for phase shifter using Tendam-Stub mounted circuits and PIN Diode. The circuit, made in microstrip line, consist of two cells having phase shifts of 22.5˚ and 90˚. The measured results are that the fabricated phase shifter of 22.5˚ and 90˚ shows phase error within about 14% at frequency range of 11.5 GHz∼12.5 GHz and insertion loss of less than 1.5 dB at center frequency.
피부 및 슬개건 결손부에 대한 동종 골슬개건골을 이용한 2단계 재건술 -1례 보고-
이병일 ( Byung Ill Lee ),김준범 ( Jun Bum Kim ),민경대 ( Kyung Dae Min ),전병휘 ( Byung Whee Jeon ) 대한슬관절학회 2006 대한슬관절학회지 Vol.18 No.2
Various reconstructive surgery have been performed for repair of the patellar tendon defect due to direct trauma or infected open wound. But most surgical procedure need wide skin incision and soft tissue dissection, that result in joint stiffness or muscle weakness. We carried out two-stage reconstructive surgery used bone-patellar tendon-bone allograft and bioabsorbable interference screw for skin and patellar tendon defect due to repetitive debridment for infected wound management. The result was satisfactroy and the patient achieved nearly full return of knee motion and quadriceps strength.